package logintest;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

@WebServlet("/index")
public class IndexServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        HttpSession session = req.getSession(false);

        if (session == null) {
            //用户未登录
            resp.setContentType("text/html;charset=utf8");
            resp.getWriter().write("当前用户未登录!");
            return;
        }

        String username = (String) session.getAttribute("username");
        if (username == null) {
            resp.setContentType("text/html;charset=utf8");
            resp.getWriter().write("当前用户未登录");
            return;
        }

        //上述检查都没问题
        resp.setContentType("text/html;charset=utf8");
        resp.getWriter().write("欢迎:" + username);

    }
}
